Heating apparatus



Nov. 29,1927. J. T. JANETTE HEATING APPARATUS Filed Feb. 27, 1922 M&

. JIZUeIZ/Ofl' 75/? 7175126756 I JOHN T. JANETTE, OF CHICAGO, ILLINOIS.

HEATING APPARATUS.

Application filed February 27, 1922. Serial No. 539,472.

This invention relates more particularly to apparatus adapted to burnliquid fuel or such fuel as may be pumped or forced through pipes.Various types of liquid fuel burners or heaters have been proposed foruse in connection with the heating systems for houses and the like andthe present burner is intended as an improvement on such systemsalthough of course it may be used whenever applicable. In these systemsthe air and fuel are usually pumped or forced to the burner by a singlemotor whereby the full quantity of air will be supplied at thetime themotor is started and the fuel begins to flow. On this account there isapt to be an excess of air which will prevent the proper ignition andcombustion of the fuel for a short time until the combustion chamber hasbecome heated.

The principal object of this invention is to provide means forregulating the air in a system of this characterwhereby the air will begradually supplied to the burner after the fuel has started flowing.Other objects and advantages will appear from the following description.

In the accompanying drawings illustrating one form of this invention;

Figure 1 is a side view of the apparatus, the parts being showndiagrammatically or shown in section for convenience in illustration;

Figure 2 is a detail of a controlling device for actuating the airregulating Valve; and

Figure 3 is a cross section of the air supply pipe showing thecontrolling valve.

In the apparatus as shown in these drawings, 3 indicates a combustionbox or chainber which is supplied with air under pressure through thesupply pipe 4. Any suitable means may be used for supplying the air butin this instance it is forced into the pipe 4 by means of a fan 5 whichis driven from the motor 6. This motor also drives a pump 7 for pumpingthe liquid fuel. The intake pipe 8 is connected with a supply tank 9.The outlet pipe 10 from the pump 7 leads to a controlling device orgovernor 11. This comprises a cylinder 12 with a piston 13 which ispressed in one direction by a spring 14. The piston rod 15 is connectedby means of a link 16 with a crank arm 17 which carries a valve ordamper 18 in the air supply pipe 4. While any suitable valve andconnection may be utilized,

this forms a convenient means of regulating the air bv the movement ofthe piston rod.

The cylinder 12 may be provided with a relief valve 19 to control theair passing into and out of the adjacent end of the cylinder. A secondfuel pipe 20 leads from the oppo site end of the cylinder to the burnerjet or nozzle 21 which is arranged within the re duced end of the airsupply pipe 4. A branch or overflow pipe 22 leads back to the supplytank 9 and is preferably provided with a gauge 23 and with an adjustablecheck valve 24. It is the intention to have the pump supply an excess offuel at all times when it is running so that there will be a certainamount of fuel passing back to the tank through the overflow pipe 22.The combustion chamber 3 is provided with any suitable means forigniting the fuel oil such as a gas pilot light 25.

The motor 6 may be provided with any suitable automatic or manualcontrolling means (not shown) such means being no part of thisinvention. When the motor 6 is started, the pump begins to pump oilthrough the pipe 10 to the cylinder 12 and this oil begins to flow outthrough the pipe 20 to the jet 21. The pipe 20 or at least the outletfrom the cylinder 12 is preferably smaller than the inlet so that apressure will be created against the piston 13 which will force thepiston against the spring and will cause the piston rod and connectionsto actuate the air regulating valve 18 so as to gradually open the samewhereupon the supply of air to the combustion chamber will be graduallyincreased and the valve will be held in open or predetermined position.as long as there is pressure in the cylinder. As soon as the motor isstopped, the pressure against the piston will be reduced and the spring14 will return the piston to normal position and simultaneously closethe valve 18. By means of this arrangement it will be seen that the fueloil .will have an opportunity to be supplied to the combustion chamberfor a predetermined period and will be thoroughly ignited before thecomplete supply of air is admitted to the chamber. This also preventsthe excessive air from blowing out the pilot flame or weakening theflame so that it will not properly ignite the fuel. lVhile I have shownthe air controlling valve in the exhaust pipe of the fan, it will benoted that this valve may be posiparts and details of constructionwithout departing from the scope of this invention.

What I claim and desireto secure by Letters Patent is:

An apparatus of the character set forth 10 comprising a burner, a motor,a fan driven by said motor, a pipe from the same to the burner, a valvein said pipe, a pump driven by said motor, a connection from said pumpto'a fuel supply tank, a' cylinder having a piston therein, a pipe fromsaidpump to one end of the cylinder, a pipe leading from thecorresponding end of the cylinder to the burner, an overflow pipeconnecting with said last named pipe and leading to thetank, connectionsfrom the piston to the valve whereby the valve will be opened by thepressure of the fuel in the cylinder and a spring for returning thepiston to normal position.

JOHN T. JANETTE.

